What the fuck is wrong with my penis?

There is a black bubble on the head, filled with old blood i believe. It's not like, swollen or anything, just a black bubble of dead blood. Could it be from fapping too much, or something else? I had the same around a year ago, when my GF moved 100 miles away (We had phone sex 3-5 times a day).

Or is it just random? Help me out lounge.

i got a blister from fuckin my ex when she had a tampon in. the string was inside her vagina and she forgot about it. She ended up actaully puting ANOTHER one in there. and then after a week i found this huge mass in there and it was the most dialated bloody putred piece of cotton ever.   so that bitch had 2 tampons in. and it really stretched out her vagina. But yea. enough about me. yours is probably AIDs